This fish food contains Metronidazole, which we recommend to treat Hexamitia. Hexamitia is the most common Internal Parasite contracted by many Cichlids, especially Discus. Hexamitia is sometimes called the "Wasting Away Disease". Fish with Hexamitia can definitively be diagnosed if they have a white stringy feces. Other symptoms of Hexamitia are the fish eating very little, especially in the latter stages of the disease. This food is concentrated, so any eaten will have great results. Fish infected with the Hexamitia Parasite will become emaciated (very thin) and their head bones will become apparent in the end stages of the disease. The fish will often become darker than normal. Hexamitia is most commonly contracted by eating frozen or live Blood Worms. Freezing does not kill the parasite. For that reason, we do not recommend feeding any fish with frozen Blood Worms. Rather we recommend Freeze Dried Blood Worms. Since the disease is internal it is necessary to medicate internally.